1 files changed, 32 insertions, 0 deletions
diff --git a/third_party/rust/hashbrown/benches/insert_unique_unchecked.rs b/third_party/rust/hashbrown/benches/insert_unique_unchecked.rs
new file mode 100644
index 0000000000..857ad18e57
--- /dev/null
+++ b/third_party/rust/hashbrown/benches/insert_unique_unchecked.rs
@@ -0,0 +1,32 @@
+//! Compare `insert` and `insert_unique_unchecked` operations performance.
+
+#![feature(test)]
+
+extern crate test;
+
+use hashbrown::HashMap;
+use test::Bencher;
+
+#[bench]
+fn insert(b: &mut Bencher) {
+    let keys: Vec<String> = (0..1000).map(|i| format!("xxxx{}yyyy", i)).collect();
+    b.iter(|| {
+        let mut m = HashMap::with_capacity(1000);
+        for k in &keys {
+            m.insert(k, k);
+        }
+        m
+    });
+}
+
+#[bench]
+fn insert_unique_unchecked(b: &mut Bencher) {
+    let keys: Vec<String> = (0..1000).map(|i| format!("xxxx{}yyyy", i)).collect();
+    b.iter(|| {
+        let mut m = HashMap::with_capacity(1000);
+        for k in &keys {
+            m.insert_unique_unchecked(k, k);
+        }
+        m
+    });
+}